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Experimental induction of intraspecific morphometric variability in a single population of Halicephalobus cf. gingivalis may surpass total interspecifc variability

Pamela Fonderie UGent, Hanne Steel UGent, Tom Moens UGent and Wim Bert UGent (2013) NEMATOLOGY.
abstract
Although molecular techniques are revolutionising nematode taxonomy, morphological data still form the basis of nematode species descriptions. However, morphological characters show a natural variability that should be taken into account before describing new species. Current study presents the results of an elaborate morphometric study of Halicephalobus cf. gingivalis, including 15 measurements and 13 indices of 540 specimens, the progeny of a single parthenogenetic female and cultured under different temperature and food conditions and measured in different adult age groups, i.e., young adults with a developed vulva but before the onset of oviposition, adults laying eggs, and old, post-reproductive adults near the end of their life cycle. The morphometric characters were analysed using both univariate (analysis of variance) and multivariate (principal components and canonical discriminant analysis) techniques. The main results reveal that the morphometric characters most used in Halicephalobus identification keys have a huge variability within a single progeny, e.g., body length 1.9 times longer than the shortest or ratio VA/tail length 3.9 times larger than the smallest. This variability has a magnitude that has not been observed in nematodes before. Further, by changing the environmental factors, the morphometric characters are influenced to an extent that one could assign – with seemingly ‘statistical support’ – different ‘species’ of the genus to different subpopulations. With this experimental study we provide convincing elements to advocate an integrative taxonomic approach and to discourage the description of new species based only on morphometric differences.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
submitted
subject
keyword
multivariate statistics, variation, Micronema, morphometry
journal title
NEMATOLOGY
Nematology
JCR category
ZOOLOGY
JCR impact factor
1.247 (2013)
JCR rank
58/153 (2013)
JCR quartile
2 (2013)
ISSN
1388-5545
language
English
UGent publication?
yes
classification
A1
id
3035621
handle
http://hdl.handle.net/1854/LU-3035621
date created
2012-10-26 19:54:51
date last changed
2012-10-29 10:34:04
@article{3035621,
  abstract     = {Although molecular techniques are revolutionising nematode taxonomy, morphological data still form the basis of nematode species descriptions. However, morphological characters show a natural variability that should be taken into account before describing new species. Current study presents the results of an elaborate morphometric study of Halicephalobus cf. gingivalis, including 15 measurements and 13 indices of 540 specimens, the progeny of a single parthenogenetic female and cultured under different temperature and food conditions and measured in different adult age groups, i.e., young adults with a developed vulva but before the onset of oviposition, adults laying eggs, and old, post-reproductive adults near the end of their life cycle. The morphometric characters were analysed using both univariate (analysis of variance) and multivariate (principal components and canonical discriminant analysis) techniques. The main results reveal that the morphometric characters most used in Halicephalobus identification keys have a huge variability within a single progeny, e.g., body length 1.9 times longer than the shortest or ratio VA/tail length 3.9 times larger than the smallest. This variability has a magnitude that has not been observed in nematodes before. Further, by changing the environmental factors, the morphometric characters are influenced to an extent that one could assign -- with seemingly {\textquoteleft}statistical support{\textquoteright} -- different {\textquoteleft}species{\textquoteright} of the genus to different subpopulations. With this experimental study we provide convincing elements to advocate an integrative taxonomic approach and to discourage the description of new species based only on morphometric differences.},
  author       = {Fonderie, Pamela and Steel, Hanne and Moens, Tom and Bert, Wim},
  issn         = {1388-5545},
  journal      = {NEMATOLOGY},
  keyword      = {multivariate statistics,variation,Micronema,morphometry},
  language     = {eng},
  title        = {Experimental induction of intraspecific morphometric variability in a single population of Halicephalobus cf. gingivalis may surpass total interspecifc variability},
  year         = {2013},
}

Chicago
Fonderie, Pamela, Hanne Steel, Tom Moens, and Wim Bert. 2013. “Experimental Induction of Intraspecific Morphometric Variability in a Single Population of Halicephalobus Cf. Gingivalis May Surpass Total Interspecifc Variability.” Nematology.
APA
Fonderie, P., Steel, H., Moens, T., & Bert, W. (2013). Experimental induction of intraspecific morphometric variability in a single population of Halicephalobus cf. gingivalis may surpass total interspecifc variability. NEMATOLOGY.
Vancouver
1.
Fonderie P, Steel H, Moens T, Bert W. Experimental induction of intraspecific morphometric variability in a single population of Halicephalobus cf. gingivalis may surpass total interspecifc variability. NEMATOLOGY. 2013;
MLA
Fonderie, Pamela, Hanne Steel, Tom Moens, et al. “Experimental Induction of Intraspecific Morphometric Variability in a Single Population of Halicephalobus Cf. Gingivalis May Surpass Total Interspecifc Variability.” NEMATOLOGY (2013): n. pag. Print.